APG DCR-1004 user manual - Manual (Page 17)

Rev. A3, 10/08 DCR-1003 and DCR-1004
17
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11 Loss of Echo Units = seconds
Range = 0 - 9999
Default = 5
distance reading. If a target is
sampled outside of this window
it will be ignored until it is
consecutively sampled the
number of times set in mode 9.
When the sensor accepts a new
target, the window automatically
shifts to the new target.
Sets the delay before the output
will show a loss of echo
condition. A loss of echo
condition exists when the sensor
looses all targets (receives no
echo returns). Loss of echo
condition will result in a display
reading of “0” in volume and
flow modes, or the maximum
distance of the sensor in distance
mode.
Example 1: Rapid Level Changes
If the DCR-1003, 1004 filtering is too slow and the level to be monitored is
changing rapidly, the display will seem to jump between readings instead of
scrolling smoothly as the level changes. To reduce the filtering and quicken the
response, modes 7 to 10 should be changed.
Filtering Guideline 1 - Target Level Rate of Change
A smooth and steady outputs and display reading of the target is almost
always desirable. If the level being monitored is changing rapidly and the
filtering is set too slow, the display will jump between readings instead of
scrolling smoothly as the level changes. However, if the level is changing
slowly and the filtering is set too fast, the display will track even small waves
and ripples, resulting in a constant variation in the output.